Thyca
# Thyca

Thyca is a genus of small sea snails, marine gastropod mollusks in the family Eulimidae. These snails are ectoparasites of starfish; they are relatively unmodified, the underside having become a suction disc with a central mouth that draws nourishment from the host's tissues.

## Description

The conical shell is longitudinally grooved, transparent and slightly curved.

## Species

Species within the genus Thyca include:

* Thyca astericola (A. Adams & Reeve, 1850)
* Thyca callista Berry, 1959
* Thyca crystallina (Gould, 1846)
* Thyca ectoconcha P. Sarasin & F. Sarasin, 1887
* Thyca hawaiiensis Warén, 1980
* Thyca lactea (Kuroda, 1949)
* Thyca nardoafrianti (Habe, 1976)
* Thyca sagamiensis (Kuroda & Habe, 1971)
* Thyca stellasteris Koehler & Vaney, 1912

### Species brought into synonymy

* Thyca pellucida Kükenthal, 1897: synonym of Thyca crystallina (Gould, 1846)
